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Home My WebLink AboutSW5221001_Design Calculations_20230609 (2) Complete this sheet if required by your reviewing authority. Project Information Contact them for any questions. Grey boxes/text are optional. SNAP v4.2.0 L O C A T I O N Project Name (optional):ƒƭƷĻğķ {ƷğƷĻ tğƩƉ Parcel ID (optional): ķğƷĻ menu Submission Date (optional):Nutrient Management Watershed:bĻǒƭĻ menumenu Local Jurisdiction / Reviewing Agency:{ƷğƷĻΉCĻķĻƩğƌ Subwatershed:bĻǒƭĻΏƦƦĻƩ menu Project Latitude Coordinates (optional):b Phosphorus Delivery Zone:bĻǒƭĻ Ώ ƦƦĻƩ ЉЌЉЋЉЋЉЊ menu Project Longitude Coordinates (optional): Nitrogen Delivery Zone:bĻǒƭĻ Ώ ƦƦĻƩ ЉЌЉЋЉЋЉЊ P R O J E C T D E T A I L S Ћ menu ŅƷ Development Land Use Type:LƓƭƷźƷǒƷźƚƓğƌ Disturbed Area:ЌБАͲАЉЉ y/nmenu Part of Common Development Plan?Ɠƚ Project Activity:wĻķĻǝĻƌƚƦƒĻƓƷ y/ny/n Designated Downtown Area?Ɠƚ Project Drains to SA Waters?Ɠƚ y/nmenu Public Linear Road/Sidewalk Project?Ɠƚ Pre-Project Land Use:ŅƚƩĻƭƷ menu Project Owner Type:{ƷğƷĻ ƓƚƓΏb/5hProject Description (optional): S T O R M W A T E R D E T A I L S %y/n (Falls ONLY) Onsite Reduction % Req.Project Uses LID/Runoff Volume Match?Ɠƚ y/ny/n Existing BUA/Development Onsite?Local Gov't nutrient req's same as State?ǤĻƭ ķğƷĻ y/n Local Gov't cutoff date for Existing BUA:Project Drains to Regional SCM?Ɠƚ ƌĬΉğĭΉǤƩƌĬΉǤƩ Nitrogen Export Rate Target:Ќ͵ЏЉ Total Nitrogen Offset Credits Needed: ƌĬΉğĭΉǤƩƌĬΉǤƩ Phosphorus Export Rate Target:Total Phosphorus Offset Credits Needed: SNAP v4.2.0 tƩĻĭźƦźƷğƷźƚƓ Raleigh Project Area and Offsite Land Cover Characteristics {ƷğƷźƚƓʹ /ƌźĭƉ ŷĻƩĻ Ʒƚ ƭĭƩƚƌƌ ķƚǞƓ Ʒƚ ĻƩƩƚƩ ƒĻƭƭğŭĻƭ ƚƓ Ʒŷźƭ ƭŷĻĻƷ͵ Copy & Paste VALUES ONLY for Best Results 22 2 PROJECT AREA LAND COVERSb 9a/ ΛƒŭΉ\[Μt 9a/ ΛƒŭΉ\[Μ Pre-Project Area (ft)Post-Project Area (ft)Change pre-to-post (ft) Roof Њ͵ЊБЉ͵ЊЊ 1,900 ЊͲЊЉЉЌͲЉЉЉ Roadway Њ͵ЏЍЉ͵ЌЍ 0 Њ͵ЍЋЉ͵ЊБ 6,000 Parking/Driveway/Sidewalk ЊАВͲЏЉЉЊБЎͲЏЉЉ Protected Forest Љ͵ВАЉ͵ЉЌЏͲЋВЋͲЍЉЉЏͲЋБЍͲЎЉЉ-7,900 Managed Pervious/Landscaping Ћ͵ЍБЊ͵ЉА 0 Offsite or Existing Roof Њ͵ЊБЉ͵ЊЊ 0 Њ͵ЏЍЉ͵ЌЍ 0 Offsite or Existing Roadway Offsite or Existing Parking/Driveway/Sidewalk Њ͵ЍЋЉ͵ЊБ 0 Offsite Protected Forest Љ͵ВАЉ͵ЉЌ 0 Ћ͵ЍБЊ͵ЉА 0 Offsite Managed Pervious CUSTOM LAND COVER 1 0 CUSTOM LAND COVER 2 0 CUSTOM LAND COVER 3 0 LAND TAKEN UP BY SCM Њ͵ЊБЉ͵ЊЊ 0 Total (Regulated & UnReg) Area ЏͲЍАЌͲЊЉЉ͵ЉЉЏͲЍАЌͲЊЉЉ͵ЉЉ Project (Regulated) Area ЏͲЍАЌͲЊЉЉ͵ЉЉЏͲЍАЌͲЊЉЉ͵ЉЉ SNAP v4.2.0 Nutrient Export Summary Landcover & SCM Data Review Errors / AdvisoriesErrors / Advisories 2 Avg Annual precip (in) = 46.220 SCM Area (ft) = Total (Regulated + 2 6,473,1000 SCM Treated Area (ft) = 2 Unregulated) Area (ft) = Project (Regulated) Catchment Routing: 6,473,100No errors 2 Area (ft) = Net BUA (Project Area Treating Runoff from Net BUA indicates new development or expansion. 7,900no 2 Existing BUA or Offsite: BUA only ft) = Custom Landcovers are 2 no387,700 Disturbed Area (ft) = present: Total Nitrogen Export Target Total Phosphorus Export Target 534.970.00 Scaled to Project Area (lb/yr):Scaled to Project Area (lb/yr): Total Area Total Area Project Area Total Area Project Area Total Area Project Area Project Area Total Area Project Area (Onsite + Post-Project Post-Project Post-Project Post-Project Post-Project Post-Project (Onsite Only) Post-Project Post-Project Nutrient Export Summary Offsite) before before SCM-Treated SCM-Treated Untreated Untreated Pre-Projectafter Treatmentafter Treatment Pre-ProjectTreatmentTreatmentArea OnlyArea OnlyAreasAreas Area (All Landcover Types) (acres) 148.6019148.6019148.6019148.6019148.6019148.60190.00000.0000148.6019148.6019 Percent Built-Upon Area (BUA) (%) 3%3%3%3%3%3%0%0%3%3% Built-Upon Area (BUA) (sqft) 180,700180,700188,600188,600188,600188,60000188,600188,600 3 1,685,7071,685,7071,710,3541,710,3541,710,3541,710,354001,710,3541,710,354 Annual Runoff Volume (ft/yr) Annual Runoff % Change 1%1%1%1% Total Runoff Change (cuft/yr) 24,64724,64724,64724,647 Total Nitrogen EMC (mg/L) 1.131.131.131.131.131.130.000.001.131.13 Total Nitrogen Load Leaving Site (lb/yr) 118.77118.77120.90120.90120.90120.90 0.000.00120.90120.90 ƚƷğƌ bźƷƩƚŭĻƓ \[ƚğķźƓŭ wğƷĻ ΛƌĬΉğĭΉǤƩΜ 0.800.800.810.810.810.810.000.000.810.81 Total Nitrogen % Change Pre-to-Post 2%2%2%2% Total Nitrogen Change (lb/yr) Pre-to-Post 2.132.132.132.13 Total Phosphorus EMC (mg/L) 0.080.080.080.080.080.080.000.000.080.08 Total Phosphorus Load Leaving Site (lb/yr) 8.728.728.988.988.988.98 0.000.008.988.98 ƚƷğƌ tŷƚƭƦŷƚƩǒƭ \[ƚğķźƓŭ wğƷĻ ΛƌĬΉğĭΉǤƩΜ 0.060.060.060.060.060.060.000.000.060.06 Total Phosphorus % Change Pre-to-Post 3%3%3%3% Total Phosphorus Change (lb/yr)Pre-to-Post 0.260.260.260.26 SCM/Catchment Summary Volume TN Reduction TP Reduction b hǒƷ t hǒƷ SCM ID and TypeFalls Lake ONLY: Onsite Reduction Compliance Check Reduction (%)(%)(%)ΛƌĬƭΉğĭΉǤƩΜΛƌĬƭΉğĭΉǤƩΜ Catchment 1 NitrogenPhosphorus 0.00%0.00%0.00%0.000.00 101: NA Onsite % Reduction Requirement 0.00%0.00%0.00%0.000.00 102: NA Export Target Scaled to Area (lb/yr) 0.00%0.00%0.00%0.000.00 534.97 103: NA Export Load Post-Project Before Treatment 0.00%0.00%0.00%0.000.00 120.908.98 Total Reduction Need (lb/yr) Catchment 2 0.00%0.00%0.00%0.000.00 201: NA Onsite Reduction Need (lb/yr) 0.00%0.00%0.00%0.000.00 202: NA Onsite Export Target (lb/yr) 0.00%0.00%0.00%0.000.00 203: NA Project Area Post-Project After Treatment 0.00%0.00%0.00%0.000.00 120.908.98 0.00%0.00%0.00%0.000.00 Catchment 3 301: NA 0.00%0.00%0.00%0.000.00 302: NA 0.00%0.00%0.00%0.000.00 303: NA 0.00%0.00%0.00%0.000.00 Catchment 4 0.00%0.00%0.00%0.000.00 401: NA 0.00%0.00%0.00%0.000.00 402: NA 0.00%0.00%0.00%0.000.00 403: NA 0.00%0.00%0.00%0.000.00 Catchment 5 0.00%0.00%0.00%0.000.00 501: NA 0.00%0.00%0.00%0.000.00 502: NA 0.00%0.00%0.00%0.000.00 503: NA 0.00%0.00%0.00%0.000.00 Catchment 6 0.00%0.00%0.00%0.000.00 601: NA 0.00%0.00%0.00%0.000.00 602: NA 0.00%0.00%0.00%0.000.00 603: NA 0.00%0.00%0.00%0.000.00